Changed the default targetname value.

Matthijs van der Wildrequested to merge
match_default_values_targetname into master

workflows/linc_target/prep.cwl, steps/find_skymodel_target.cwl and scripts/download_skymodel_target.py use the same input variable targetname, but use different default values. This can create issues the python script is used as a standalone and the resulting skymodel is sent through the pipeline. This patch sets them all equal to the value "pointing".

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